COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

A compressor at high altitudes will require ___ power.

More

Same

Less

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Reciprocating air compressor is best suited for

Small quantity of air at low pressure

Small quantity of air at high pressure

Large quantity of air at low pressure

Large quantity of air at high pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by

W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)

W₁/W₂ = n₁/n₂

W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)

W₁/W₂ = n₂/n₁

TRUE ANSWER : ?
YOUR ANSWER : ?

The compression ratio for the compressor is always _________ unity.

More than

Equal to

None of these

Less than

TRUE ANSWER : ?
YOUR ANSWER : ?

Surging is the phenomenon of

Air stream not able to follow the blade contour

Unsteady, periodic and reversed flow

Motion of air at sonic velocity

Air stream blocking the passage

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

Less loss of air due to leakage past the cylinder

Less power requirement

Better mechanical balance

Lower volumetric efficiency

TRUE ANSWER : ?
YOUR ANSWER : ?

The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Stator to static enthalpy rise in the rotor

Stator to static enthalpy rise in the stage

Rotor to static enthalpy rise in the stator

Rotor to static enthalpy rise in the stage

TRUE ANSWER : ?
YOUR ANSWER : ?

In the axial flow gas turbine, the work ratio is the ratio of

Compressor work and turbine work

Actual compressor work and theoretical compressor work

Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet

Output and input

TRUE ANSWER : ?
YOUR ANSWER : ?

Inter-cooling in gas turbine results in

Decrease in both thermal efficiency and net output

Increase in both thermal efficiency and net output

Increase in thermal efficiency but decrease in net output

Increase in net output but decrease in thermal efficiency

TRUE ANSWER : ?
YOUR ANSWER : ?

In a four stage compressor, if the pressure at the first and third stage is 1 bar and 16 bar, then the delivery pressure at the fourth stage will be

16 bar

64 bar

1 bar

256 bar

TRUE ANSWER : ?
YOUR ANSWER : ?